Individual people aren't dumb... but groups of people are not only dumb, they are dangerous- utterly incapable of independent thought, let alone capable of exercising the critical reasoning necessary to make competent decisions about anything. I wouldn’t want most voters to decide something even as meaningless as what type of sandwich I should order for lunch.
Why do I think someone running for president is so clearly mentally ill or evil? Look at it this way: These people are TRYING to get a horrible-paying job that has the highest level of responsibility in our nation, the highest level of stress imaginable, entails perpetual sleep deprivation, constant surveillance, constant public and international scrutiny, and they instantly become a clear, specific and desirable target for all who are disgruntled- both nationally and internationally.
And it doesn't matter WHICH party or ideology those lemmings agree with or which group they choose to march toward the edge of the cliff with, because they all march while insisting they are not a member of the group and instead are merely walking the same way, to the same place, at the same time, for the same goal, together. But it’s not their fault.